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Updated: May 21, 2026

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
Published on: March 13, 2013
Eigenvalue equation and core-mode cutoff of weakly guiding tapered fiber as three layer optical waveguide and used as
C L Linslal1, P M S Mohan, A Halder
1Central Glass and Ceramic Research Institute, Council of Scientific and Industrial Research (CSIR), 196, Raja S.C. Mullick Road, Kolkata-700032, India.
Abstract:
The core-mode cutoff plays a major role in evanescent field absorption based sensors. A method has been proposed to calculate the core-mode cutoff by solving the eigenvalue equations of a weakly guiding three layer optical waveguide graphically. The variation of normalized waveguide parameter (V) is also calculated with different wavelengths at core-mode cutoff. At the first step, theoretical analysis of tapered fiber parameters has been performed for core-mode cutoff. The taper angle of an adiabatic tapered fiber is also analyzed using the length-scale criterion. Secondly, single-mode tapered fiber has been developed to make a precision sensor element suitable for chemical detection. Finally, the sensor element has been used to detect absorption peak of ethylenediamine. Results are presented in which an absorption peak at 1540 nm is observed.
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